Why are my leaves getting brown yellow?

Hello Are the diary specifics the same as your fast eddy? You look like you're having many things...deficiency toxicity a bit like a copper deficiency, but usually that is down to ph. So if you're feeding reasonable amounts of cannabis friendly nutrients then i think you need to double check the ph. In going, run off and then possibly recalibrate the ph pen and double check again.👍 Maybe do the heat test with your hand above the plant and see if your hand gets hot from the light too just to consider light stress.